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the solution:
7
9
8
6
1
4
5
3
2
1
3
4
2
8
5
9
7
6
6
2
5
3
7
9
1
8
4
8
4
7
9
5
2
3
6
1
3
5
9
8
6
1
2
4
7
2
6
1
7
4
3
8
9
5
4
8
3
5
2
7
6
1
9
9
7
2
1
3
6
4
5
8
5
1
6
4
9
8
7
2
3